Saw and saw blade

Abstract

A wall saw includes a saw head which is displaceable longitudinally on a running rail and has a swivelable saw arm and a saw blade with cutting elements which is detachably fastened to the saw arm. The saw blade is rotatable by means of a drive unit which is mounted on the saw arm and which communicates with a drive arrangement. The saw blade is fastened to the saw arm via a coupling formed of two flange halves (11,17) which slide one inside the other and which can be connected with one another in a detachable manner, one flange half (11) being fastened to the flat side of the saw blade facing the saw arm and the second flange half (17) being arranged at the saw arm.

We claim: 
     
       1. Wall saw comprising a saw head (4) which is displaceable longitudinally on a running rail (3) and has a swivelable saw arm (5) and a saw blade (6) with cutting elements which is detachably fastened to the saw arm (5) and is rotatable by means of a drive unit (8) which is mounted on the saw arm (5) and communicates with a drive arrangement (2), characterized in that the saw blade (6) is fastened to the saw arm (5) via a coupling comprising two flange halves (11, 17) which slide one inside the other and which can be connected with a another in a detachable manner, one flange half (11) being fastened to a flat side (29) of the saw blade (6) facing the saw arm (5) and a second flange half (17) being arranged at the saw arm (5). 
     
     
       2. Arrangement according to claim 1, characterized in that the drive unit (8) includes a driving spindle, the second flange half (17) being mounted rotatably on the latter. 
     
     
       3. Arrangement according to claim 1 or 2, characterized in that the first flange half (11) which is connected with the saw blade (6) is constructed as a female flange and has a roughly V-shaped recess (13) which opens toward the circumference of the first flange half (11) and serves to receive and center a corresponding roughly V-shaped projection (19) which projects from the side (18) of the second flange half (17) facing the saw blade (6), the second flange half (17) forming a male part. 
     
     
       4. Arrangement according to claim 3, characterized in that the inner width (w) of the recess (13) increases along its depth (d) and the width (b) of the projection (19) decreases in a corresponding manner along its height (h) in the direction of the end face (18) of the second flange half (17) such that the two flange halves (11, 17) fit together substantially exactly in the assembled state, wherein the depth (d) of the recess (13) and the height (h) of the projection (19) substantially correspond to one another. 
     
     
       5. Arrangement according to claim 4, characterized in that retaining screws (21) are provided in an approximately radial arrangement at the circumference of the first flange half (11) and project into the recess (13) and can be screwed into corresponding radial bore holes provided with internal threads at the projection (19) of the second flange half. 
     
     
       6. Arrangement according to claim 5, characterized in that the flange halves (11, 17) are outfitted with means for locking against rotation preventing the saw blade (6) from rotating when the assembled flange halves (11, 17) have not been secured radially. 
     
     
       7. Arrangement according to claim 6, characterized in that the means for locking against rotation comprise an axially displaceable ring (23) which is arranged at the circumference of the second flange half (17) and which can be slipped over the first flange half (11), provided the retaining screws (21) are screwed in flush with the surface, and fixed in a detachable manner, the ring (23) having at its side remote of the saw blade (6) at least one projecting cam (24) which, when the two flange halves (11, 17) are not secured radially, cooperates with means which are rigidly arranged at the saw head (4) or saw arm (5), e.g., a protective holder (28) for the saw blade, to prevent rotation of the saw blade (6). 
     
     
       8. Saw blade to be used with a wall saw in accordance with claim 4, charaterized in that the saw blade is connected, at the side (29) facing the saw head (4), with a flange half (11) constructed as a female part having the approximately V-shaped recess (13) opening toward the circumference of the flange half (11), an inner width (w) of the recess (13) increasing along a depth (d) thereof. 
     
     
       9. Saw blade according to claim 8, characterized in that the female flange half (11) is detachably connected with the saw blade (6) and is held, by a plurality of screws (14) which can be inserted from an opposite side (30) of the saw blade (6) through evenly spaced radial bore holes arranged in the saw blade (6) and screwed into bore holes in the female flange half (11) so as to be flush with the surface of the saw blade (6). 
     
     
       10. Saw blade according to claim 8, characterized in that a carrying member (25) is detachably connectible with the saw blade (6), the carrying member (25) comprising at least one carrying handle (26) connected with a flange half (27) whose outer contour corresponds to the recess (13) at the female flange half (11) and has a roughly V-shaped configuration which decreases in width (b) along its height corresponding to the width increase in the recess (13) such that an two flange halves (11, 27) are axially fixed in the assembled state.